after_midnight.rb

class ScheduleTime
  attr_reader :seconds, :orig_hour, :hour, :minute, :second
  def initialize(time, time_of_day)
    #raise ArgumentError
    @time = time
    @time_of_day = time_of_day
    parse_time
  end
  
  def parse_time
    m = @time.scan(/(\d+)/)
    @orig_hour, @minute, @second = m.map!{|m| m[0].to_i}
  end
  
  def second
    @second || 0
  end
  
  def hour
    case @time_of_day
    when "morning"
      @orig_hour
    when "afternoon"
      @orig_hour+12 if @orig_hour < 7
    when "midnight"
      @orig_hour+24 if @orig_hour < 7
    end
  end
  
  def seconds
    hour*60+minute*60+second
  end
  
  def to(format)
    format.new(self)
  end
  
  def next_time_of_day
    case @time_of_day
    when "morning"
      "afternoon" if hour >= 12
    when "afternoon"
      "midnight" if hour >= 24
    when "midnight"
    end
  end
  
  [:>=, :<=, :==, :<, :>].each do |comparator|
    define_method comparator do |time|
      self.seconds.send(comparator, time.seconds)
    end
  end
end

class ArmyTime < ScheduleTime
  def hour
    case @time_of_day
    when "morning"
      @orig_hour
    when "afternoon"
      @orig_hour
    when "midnight"
      @orig_hour+24 if @orig_hour < 13
    end
  end
end

class DesiredTime
  attr_reader :result, :new_time_of_day
  def initialize(schedule_time, options={})
    @new_time_of_day = schedule_time.next_time_of_day
  end
end

class GtfsTime < DesiredTime
  def initialize(schedule_time, options={})
    super
    @result = "#{schedule_time.hour}:#{schedule_time.minute}:#{schedule_time.second}"
  end
end

class ISeptaTime < DesiredTime
  def initialize(schedule_time, options={})
    super
    @result = Time.local(2009, 01, 01, schedule_time.hour, schedule_time.minute, schedule_time.second)
  end
end

puts ArmyTime.new('14.43', 'afternoon').to(GtfsTime).result
puts ScheduleTime.new('1.43', 'afternoon').to(ISeptaTime).result

puts ScheduleTime.new('1.43', 'afternoon') <= ScheduleTime.new('1.43:01', 'afternoon')